Key-plug.



C. A. DILLON.

KEY PLUG.

APPLICATION mso :uns la, 1913.

Patented Apr. 27, 1915.

H N M T T AH i riew of the body plate and `clamped together;

BILLON. 0l CANTON. OHM), ASSEGNO?, TO THE NETE@ "ELECTEQ mii-PLUG.

Speccatten of Letters atent.

Taten/ted kpn 2 9 MM5..

Application filed June te, wir?. serato, Wagga,

To al?, whom it may concern ide it known that Tl, Guantes A. Dumon, e citizen ot the United States, residing at Canton. in the county of Stark and State of hio, have invented certain new andl useful improvements in 'Key-Plugs, ot which the vollowing is a speciiication. y

rthe invention relates to plugs :tor closing1 inlet openings and orifices ot pipes., and other parts of suction cleaning` apparatus.; and the obiect of the improvement is to provide an eilicient and durable plug having a resilient body portion with a head portion which will not oe mutilated or deformed by the key u hich isusually employed as a handle for inserting and removing the. plug into and ironi the opening. This object is attained by making the plug of 'rubber with a hollow cylindric body portion and providing metallic disk and socket plates in the head portion with a metallic tace plate thereon and an intervening hard spacing plate.

preferred embodiment of the invention thus set forth in gene 'al terms, is illustrated in the accompanying drawingz formingr part hereof, in which- :Figure l, is a fragmentary perspective view of a baseboard showing the face of the improved pluied therein and a key located ad 2, a perspective the socket plate in position tor assenihling; lFig'. 3, a similar i'ie'w showing the sa me plates assembled and Fig. d, is an inner side perspective View showing the rubber portion ot the plug; Fig. 5, an outer side perspective vView ot the rubber portion of the plug showing the spacingJ plate recess; Fig. u. a detached perspective View of the spacing plate; Fig. i", a .detached perspective view of the face plate; Fig. 8,' a section of the completed plug; and, Fig. 9, a. fragmentary section of an inlet pipe in a base board with a tinishing ring thereon, showing the in'iproved plug in side elevation therein.

Similar numerals refer to similar parts throughout the drawings.

rlhe head plate l. is referably made of sheet or malleable metal 1n the form of a dat disk having the central key hole 2 formed therein, and a plurality ot tongues 3 cut and bent inward from the eripheral portion thereof forming a plura ity ot peri heral notches 3. 'llhe socket plate i is li revlise preferably inade'ot sheet metal in the forni jacent to the key hole; ll'ig.

oit a spherical cup with the peripheral tlange 5 thereon which is entered inside the tongues 3 ot the body plate. The tongues 3a are' clamped around the peripheral iange 5 to securely hold the socket plate in position, as shown in Fig. 3. The rubber portion of the plug is then formed or molded upon and around Kthe head and socket plates in the usual manner well known in the art.v rifhe rubber is shaped to 'form the cylindric body portion G of the plug and the coating or layer 7 on the outer side, the layer 8 on the inner side and the rim 9 around the peripheral portions of the head and socket plates.

it is evident that the entrance of the rubber into the peripheral notches 3a of the head plate and its engagement around the peripheral Harige 5 of the socket plate-'and the clamping tongues 8a of the head plate, serves to securely hold the rubber upon these parts. rlhe' recess l0 is formed in the rubber layer 'l' on the outer side of the head plate around the key hole '2 therein, into which recess is fitted the spacing plate il having; the key hole 2a therein corresponding to the key hole in the head plate, which spacing plate l1 is made ot hard material and of a thickness corresponding to the normal thickness ot the rubber layer 7 on the outer side of the body plate.

'l`he tace plate 12 of the plug is made of thin sheet metal suitably finished on its outer side and provided with the inturned rim flange 13 which is fitted around and clamped upon the rim portion 9 ot the rubber portion of the head of the plug, as shown in Figs. 8 and 9. rThe central key hole 2b is provided in the face plate, correspending lo the key holes 2 and 2 in the head and spacing plates, and it is evident that the presence of thehard spacing plate serves to sustain that portion of the face plate around the key hole from being bent inward or otherwise deformed by the insertion of the tanga la of the key llurthermore the formation of the key hole in the several hard or metallic plates prevents the edges thereof trom being;r mutilated. lt is also evident that when the tangs of the key, are inserted through the key hole into the socket lf3 formed by the metallic plates embedded in the head of the plug, these plates prevent the mutilationof the rubber portions of the plug by the manipulation of the key. And tinally, the hollow -cylindrie rubber body portion 6 of the plug is preferablymade with the well defined annular enlargement or rib 18 at or near the free rim '18 thereof, the circumference of Awhich rib is normally slightly larger than the Wall 19 of the inlet openingy or orifice, so that when the plug is entered into the orifice, the circumferential compression of the rib makes an air vtight it of the rim p0rtion of the plug in the orifice.

I elaim:

'-1. A key plug composed of rubber including a head portion and a hollow cylindric body portion having a free rim at its inner end, there beingr an annular rib around the bodyportion adjacent-to the free rim thereof.

2. A key' plug vcomposed of rubber including a head portion with a metallic reinforcement therein and a hollow cylindric body portion having a free rim at its inner end, there being an annular rib around the body ortion adjacent to the free rim thereo 3. A key plug composed of rubber having metallic disk and Vsocket plates embedded in its head portion,v there being a key socket formed by the socket plate on the inner side of the disk plate and a central key hole com- `municating with the socket.

4. A key plug composed of rubber having metallic disk and socket plates embedded in its head portion, and a metallic face plate on the outer side thereof, there being a key socket formed by the socket plate on the inner side of the disk plate, and a key hole through the disk and face plates.

5. A key plug composed of rubber having metallic disk and socket plates embedded in its hea'd portion, a metallic face plate on the outer side thereof, and a spacing plate be tween the central portions ot` the disk and face plates, there being a key socket formed by the socket plate on the inner side ot' the disk plate and a key hole through the disk. spacing and face plates.

' CHARLES A. DILLUN.

In presence of ELFRIEDE SCHMIDT, (Juas. M. BALL. 

